When you roll a dice once what is the probability that the number is not 4?
Two (6-sided) dice roll probability table
| Roll a… | Probability |
|---|---|
| 3 | 3/36 (8.333\%) |
| 4 | 6/36 (16.667\%) |
| 5 | 10/36 (27.778\%) |
| 6 | 15/36 (41.667\%) |
What is the probability of rolling an odd number?
On a standard six sided die the probability of getting an odd number is 1/2 or 50\%. Half of the outcomes;1, 3, and 5 are odd, the other half are even; 2, 4, and 6.
What is the probability that using a fair die that you roll a 7?
For each of the possible outcomes add the numbers on the two dice and count how many times this sum is 7. If you do so you will find that the sum is 7 for 6 of the possible outcomes. Thus the sum is a 7 in 6 of the 36 outcomes and hence the probability of rolling a 7 is 6/36 = 1/6.
How many possible outcomes are there if you roll two dice?
36 different
When two dice are rolled, there are now 36 different and unique ways the dice can come up. This figure is arrived at by multiplying the number of ways the first die can come up (six) by the number of ways the second die can come up (six). 6 x 6 = 36.
When you toss two coins once how many possible outcomes?
four possible outcomes
In an experiment of flipping two coins, there are four possible outcomes.
What is the probability of getting a number divisible by 7?
The probability that a random number is divisible by 7 is obviously 1 in 7.
What is the probability of 2 heads?
The probability of getting two heads on two coin tosses is 0.5 x 0.5 or 0.25.
What is the chance of getting 7 or 11 with 2 dice?
8/36 or 2/9, 22.22\%. Nearly a 1 in 4 chance of getting 7 or 11.
What is the probability of getting a 7 on the first throw of two dice and an 11 on the second throw?
The probability of both outcomes is equal i.e. 50\% or 1/2.
What is the probability of rolling a 4 sided die?
The expected value of a dice roll is 2.5 for a standard 4-sided die (a die with each of the numbers 1 through 4 appearing on exactly one face of the die). In this case, for a fair die with 4 sides, the probability of each outcome is the same: 1/4. The possible outcomes are the numbers 1 through 4: 1, 2, 3, and 4.
What is the probability of rolling a 7 with two dice?
The combinations for rolling a sum of seven are much greater (1 and 6, 2 and 5, 3 and 4, and so on). To find the probability that the sum of the two dice is three, we can divide the event frequency (2) by the size of the sample space (36), resulting in a probability of 1/18.
What is the expected value of a 6 sided dice?
The expected value of a dice roll is 3.5 for a standard 6-sided die. This assumes a fair die – that is, there is a 1/6 probability of each outcome 1, 2, 3, 4, 5, and 6. The expected value of the sum of two 6-sided dice rolls is 7. Dice with a different number of sides will have other expected values.
What is the expected value of a single die roll?
The expected value of a single die roll is 3.5, assuming a fair 6-sided die (the numbers 1 through 6 are printed on the sides and appear exactly once each, and the probability of each outcome is 1/6). Remember that the expected value of an action is a weighted average of each possible outcome.